How about Copy plus any Class B Quirk? Your choice.
New Quirk Name: Gene Splice
This Transformation type Quirk activates whenever the user touches another Quirk user. When they do, they can then copy the Quirk of the target. The user can then replicate the specific parts of the target related to their Quirk, popping off their own part to replace it with the new one. The Quirk works best with other Quirks based on specific body parts, such as "Erasure" or "Explosion". The replaced part will look like the original's, such as having their eye color. The user can store up to five Quirks like this, may access them at any point, and will instantly learn how to use said abilities. The user can even use multiple Quirks from different body parts at the same time. After a period of time, the new part will be replaced with the user's old one. This gives the user a strong mix of options, able to constantly adjust and reinvent themselves with the powers of other people. They can copy the Quirks of enemies to learn about them, pull out new tricks in a fight, replicate intensive powers for allies, use Quirks in tandem with each other, or just heal themselves from being damaged. Though the user will need to gather up Quirks to use and deal with all their downsides. These additional parts will die off once they are used, only lasting a matter of minutes. This gets even faster if the user tries to bring out even more Quirks.













